diff options
Diffstat (limited to 'src/cairo-gstate.c')
| -rw-r--r-- | src/cairo-gstate.c | 56 |
1 files changed, 48 insertions, 8 deletions
diff --git a/src/cairo-gstate.c b/src/cairo-gstate.c index e28b7be0e..40403657c 100644 --- a/src/cairo-gstate.c +++ b/src/cairo-gstate.c @@ -750,20 +750,20 @@ _cairo_gstate_paint (cairo_gstate_t *gstate) } /** - * _cairo_operator_bounded: + * _cairo_operator_bounded_by_mask: * @operator: a #cairo_operator_t * - * A bounded operator is one where a source or mask pixel + * A bounded operator is one where mask pixel * of zero results in no effect on the destination image. * * Unbounded operators often require special handling; if you, for * example, draw trapezoids with an unbounded operator, the effect * extends past the bounding box of the trapezoids. * - * Return value: %TRUE if the operator is bounded + * Return value: %TRUE if the operator is bounded by the mask operand **/ cairo_bool_t -_cairo_operator_bounded (cairo_operator_t operator) +_cairo_operator_bounded_by_mask (cairo_operator_t operator) { switch (operator) { case CAIRO_OPERATOR_CLEAR: @@ -788,6 +788,46 @@ _cairo_operator_bounded (cairo_operator_t operator) return FALSE; } +/** + * _cairo_operator_bounded_by_source: + * @operator: a #cairo_operator_t + * + * A bounded operator is one where source pixels of zero + * (in all four components, r, g, b and a) effect no change + * in the resulting destination image. + * + * Unbounded operators often require special handling; if you, for + * example, copy a surface with the SOURCE operator, the effect + * extends past the bounding box of the source surface. + * + * Return value: %TRUE if the operator is bounded by the source operand + **/ +cairo_bool_t +_cairo_operator_bounded_by_source (cairo_operator_t operator) +{ + switch (operator) { + case CAIRO_OPERATOR_OVER: + case CAIRO_OPERATOR_ATOP: + case CAIRO_OPERATOR_DEST: + case CAIRO_OPERATOR_DEST_OVER: + case CAIRO_OPERATOR_DEST_OUT: + case CAIRO_OPERATOR_XOR: + case CAIRO_OPERATOR_ADD: + case CAIRO_OPERATOR_SATURATE: + return TRUE; + case CAIRO_OPERATOR_CLEAR: + case CAIRO_OPERATOR_SOURCE: + case CAIRO_OPERATOR_OUT: + case CAIRO_OPERATOR_IN: + case CAIRO_OPERATOR_DEST_IN: + case CAIRO_OPERATOR_DEST_ATOP: + return FALSE; + } + + ASSERT_NOT_REACHED; + return FALSE; +} + static cairo_status_t _create_composite_mask_pattern (cairo_surface_pattern_t *mask_pattern, cairo_clip_t *clip, @@ -1057,7 +1097,7 @@ _cairo_gstate_clip_and_composite (cairo_clip_t *clip, src, draw_func, draw_closure, dst, extents); - else if (_cairo_operator_bounded (operator)) + else if (_cairo_operator_bounded_by_mask (operator)) status = _cairo_gstate_clip_and_composite_with_mask (clip, operator, src, draw_func, draw_closure, @@ -1338,7 +1378,7 @@ _cairo_surface_clip_and_composite_trapezoids (cairo_pattern_t *src, if (status) return status; - if (_cairo_operator_bounded (operator)) + if (_cairo_operator_bounded_by_mask (operator)) { if (trap_region) { status = _cairo_clip_intersect_to_region (clip, trap_region); @@ -1411,7 +1451,7 @@ _cairo_surface_clip_and_composite_trapezoids (cairo_pattern_t *src, goto out; } - if ((_cairo_operator_bounded (operator) && operator != CAIRO_OPERATOR_SOURCE) || + if ((_cairo_operator_bounded_by_mask (operator) && operator != CAIRO_OPERATOR_SOURCE) || !clip->surface) { /* For a simple rectangle, we can just use composite(), for more @@ -2011,7 +2051,7 @@ _cairo_gstate_show_glyphs (cairo_gstate_t *gstate, &transformed_glyphs[i].y); } - if (_cairo_operator_bounded (gstate->operator)) + if (_cairo_operator_bounded_by_mask (gstate->operator)) status = _cairo_scaled_font_glyph_device_extents (gstate->scaled_font, transformed_glyphs, num_glyphs, |